SnowSignals

SnowSignals is a crypto market-data platform (data-as-a-service) whose TrendVane product serves multi-timeframe market-phase (regime) classifications — market state, not trade signals — for BTC, ETH, GRAM, SOL and TRX over a metered REST API and a hosted, OAuth-gated MCP server. Pricing is prepaid in stablecoin and served in-band by a free, no-auth discovery call, so an agent can compute the exact cost of a read before spending; a free phase-resolution model (successor-transition probabilities, continuation rates, MFE/MAE) supports interpreting each reading. The platform is deliberately agent-native: first-party llms.txt, self-hosted APIs.json, RFC 8414/9728 OAuth discovery, and an official MCP registry listing. A first-party x402 gateway (pay.snowsignals.io, live 2026-09-10) additionally sells the same phase reads pay-per-call in USDC on Base with no account at all.

SnowSignals publishes 5 APIs on the APIs.io network, including Notifications API, Phase API, Phases API, and 2 more. Tagged areas include Crypto, Market Data, Bitcoin, Analytics, and market-phase.

SnowSignals’ developer surface includes authentication and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub
30.9/100 thin ▬ flat Agent 49/100 agent ready Front door AI 3/6 light saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
2 APIs 2 MCP Servers
CryptoMarket DataBitcoinAnalyticsmarket-phaseregimetrendvaneDaaSMCPAgent-NativeFinancial Datax402

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 30.9/100 · thin
Contract Quality 8.6 / 19
Developer Ergonomics 3.5 / 15
Access Clarity 3.2 / 15
Operational Transparency 0.5 / 10
Contract Governance 1.6 / 9
Discoverability 5.3 / 8
Regulatory Posture 4.6 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 49/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/snowsignals: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

SnowSignals Notifications API

The Notifications API from SnowSignals — 1 operation(s) for notifications.

SnowSignals Phase API

The Phase API from SnowSignals — 6 operation(s) for phase.

SnowSignals Phases API

The Phases API from SnowSignals — 2 operation(s) for phases.

SnowSignals Time API

The Time API from SnowSignals — 1 operation(s) for time.

SnowSignals User API

The User API from SnowSignals — 3 operation(s) for user.

MCP Servers 2

Model Context Protocol servers that expose these APIs to AI agents.

SnowSignals MCP Server

MCP SERVER

SnowSignals

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Snowsignals Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Snowsignals Rate Limits

0 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Snowsignals Authentication

apiKey · 2 schemes

SECURITY

Snowsignals Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Snowsignals Scopes

1 scope

1 scopes

SCOPES

Resources

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Lifecycle
Lifecycle
 DataModel
DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubRepository
GitHubRepository
 ToolCrosswalk
ToolCrosswalk
 Packages
Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 Plans
Plans

Company 1

The organization behind the API

Website
Website

Other 2

Properties that don't map to a standard resource type

Overlay
Overlay
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
name: SnowSignals
description: 'SnowSignals is a crypto market-data platform (data-as-a-service) whose TrendVane product serves multi-timeframe
  market-phase (regime) classifications — market state, not trade signals — for BTC, ETH, GRAM, SOL and TRX over a metered
  REST API and a hosted, OAuth-gated MCP server. Pricing is prepaid in stablecoin and served in-band by a free, no-auth discovery
  call, so an agent can compute the exact cost of a read before spending; a free phase-resolution model (successor-transition
  probabilities, continuation rates, MFE/MAE) supports interpreting each reading. The platform is deliberately agent-native:
  first-party llms.txt, self-hosted APIs.json, RFC 8414/9728 OAuth discovery, and an official MCP registry listing. A first-party
  x402 gateway (pay.snowsignals.io, live 2026-09-10) additionally sells the same phase reads pay-per-call in USDC on Base
  with no account at all.'
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - snowkidind/snowsignals-mcp
    - snowkidind/snowsignals-x402
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
image: https://snowsignals.io/og-image.png
url: https://raw.githubusercontent.com/api-evangelist/snowsignals/refs/heads/main/apis.yml
created: '2026-09-10'
modified: '2026-09-10'
specificationVersion: '0.21'
tags:
- Crypto
- Market Data
- Bitcoin
- Analytics
- market-phase
- regime
- trendvane
- DaaS
- MCP
- Agent-Native
- Financial Data
- x402
tags_raw:
- crypto
- market-data
- bitcoin
- analytics
- market-phase
- regime
- trendvane
- daas
- mcp
- agent-native
- financial-data
- x402
apis:
- aid: snowsignals:snowsignals-notifications-api
  name: SnowSignals Notifications API
  description: The Notifications API from SnowSignals — 1 operation(s) for notifications.
  humanURL: https://snowsignals.io/docs
  baseURL: https://snowsignals.io/v1
  tags:
  - Notification
  tags_raw:
  - Notifications
  properties:
  - type: OpenAPI
    url: openapi/snowsignals-notifications-api-openapi.yml
  - type: Documentation
    url: https://snowsignals.io/docs
  - type: ToolCrosswalk
    url: mcp/snowsignals-tool-crosswalk.yml
  - type: Documentation
    url: https://x402.snowsignals.io
  - type: LLMsTxt
    url: llms/snowsignals-x402-llms.txt
  - type: GitHubRepository
    url: https://github.com/snowkidind/snowsignals-x402
- aid: snowsignals:snowsignals-phase-api
  name: SnowSignals Phase API
  description: The Phase API from SnowSignals — 6 operation(s) for phase.
  humanURL: https://snowsignals.io/docs
  baseURL: https://snowsignals.io/v1
  tags:
  - Phase
  properties:
  - type: OpenAPI
    url: openapi/snowsignals-phase-api-openapi.yml
  - type: Documentation
    url: https://snowsignals.io/docs
  - type: ToolCrosswalk
    url: mcp/snowsignals-tool-crosswalk.yml
  - type: Documentation
    url: https://x402.snowsignals.io
  - type: LLMsTxt
    url: llms/snowsignals-x402-llms.txt
  - type: GitHubRepository
    url: https://github.com/snowkidind/snowsignals-x402
- aid: snowsignals:snowsignals-phases-api
  name: SnowSignals Phases API
  description: The Phases API from SnowSignals — 2 operation(s) for phases.
  humanURL: https://snowsignals.io/docs
  baseURL: https://snowsignals.io/v1
  tags:
  - Phases
  properties:
  - type: OpenAPI
    url: openapi/snowsignals-phases-api-openapi.yml
  - type: Documentation
    url: https://snowsignals.io/docs
  - type: ToolCrosswalk
    url: mcp/snowsignals-tool-crosswalk.yml
  - type: Documentation
    url: https://x402.snowsignals.io
  - type: LLMsTxt
    url: llms/snowsignals-x402-llms.txt
  - type: GitHubRepository
    url: https://github.com/snowkidind/snowsignals-x402
- aid: snowsignals:snowsignals-time-api
  name: SnowSignals Time API
  description: The Time API from SnowSignals — 1 operation(s) for time.
  humanURL: https://snowsignals.io/docs
  baseURL: https://snowsignals.io/v1
  tags:
  - Time
  properties:
  - type: OpenAPI
    url: openapi/snowsignals-time-api-openapi.yml
  - type: Documentation
    url: https://snowsignals.io/docs
  - type: ToolCrosswalk
    url: mcp/snowsignals-tool-crosswalk.yml
  - type: Documentation
    url: https://x402.snowsignals.io
  - type: LLMsTxt
    url: llms/snowsignals-x402-llms.txt
  - type: GitHubRepository
    url: https://github.com/snowkidind/snowsignals-x402
- aid: snowsignals:snowsignals-user-api
  name: SnowSignals User API
  description: The User API from SnowSignals — 3 operation(s) for user.
  humanURL: https://snowsignals.io/docs
  baseURL: https://snowsignals.io/v1
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/snowsignals-user-api-openapi.yml
  - type: Documentation
    url: https://snowsignals.io/docs
  - type: ToolCrosswalk
    url: mcp/snowsignals-tool-crosswalk.yml
  - type: Documentation
    url: https://x402.snowsignals.io
  - type: LLMsTxt
    url: llms/snowsignals-x402-llms.txt
  - type: GitHubRepository
    url: https://github.com/snowkidind/snowsignals-x402
common:
- type: Overlay
  url: overlays/snowsignals-daas-overlay.yaml
- type: MCPServer
  url: https://snowsignals.io/mcp
- type: Overlay
  url: overlays/snowsignals-x402-overlay.yaml
- type: Website
  url: https://snowsignals.io
- type: TermsOfService
  url: https://snowsignals.io/terms
- type: GitHubRepository
  url: https://github.com/snowkidind/snowsignals-mcp
- type: LLMsTxt
  url: llms/snowsignals-llms.txt
- type: WellKnown
  url: well-known/snowsignals-well-known.yml
- type: MCPServer
  url: mcp/snowsignals-mcp.yml
- type: ToolCrosswalk
  url: mcp/snowsignals-tool-crosswalk.yml
- type: Authentication
  url: authentication/snowsignals-authentication.yml
- type: OAuthScopes
  url: scopes/snowsignals-scopes.yml
- type: Conventions
  url: conventions/snowsignals-conventions.yml
- type: ErrorCatalog
  url: errors/snowsignals-problem-types.yml
- type: Conformance
  url: conformance/snowsignals-conformance.yml
- type: Lifecycle
  url: lifecycle/snowsignals-lifecycle.yml
- type: Plans
  url: plans/snowsignals-plans-pricing.yml
- type: RateLimits
  url: rate-limits/snowsignals-rate-limits.yml
- type: DataModel
  url: data-model/snowsignals-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/snowsignals-domain-security.yml
- type: Packages
  url: packages/snowsignals-packages.yml
maintainers:
- FN: SnowSignals
  url: https://snowsignals.io
x-source:
  via: apis.io/add 0cabc61c, parked unverifiable_host; listed by Kin 2026-09-10 on what is served
  fetched: '2026-09-10'
  note: 'The round-1 guard ("do not reconstruct a spec") is satisfied and dropped: the real contract surfaced and was harvested
    the same day — first-party OpenAPI at https://snowsignals.io/v1/openapi.json (200, servers[] snowsignals.io/v1, contact
    snowsignals.io), live MCP at https://snowsignals.io/mcp (registry io.snowsignals/snowsignals), llms.txt and a self-hosted
    apis.json both advertised from the page head. The host soft-200s unknown HTML routes (SPA shell), so page pointers here
    are limited to provider-declared routes; JSON paths return real 404s and were probed honestly.'
x-enrichment:
  date: '2026-09-10'
  status: enriched
  artifacts_added: 4
  pass: local-v3
  note: 'Second same-day pass: found the x402 gateway LIVE (it 404d on the morning pass) — saved its first-party OpenAPI +
    llms.txt from x402.snowsignals.io, recorded the live 402 challenge in plans/ and conformance/, added the legacy npm package
    inventory (packages/), and registered the gateway as a second API entry.'

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